Pressure-controlled valve.



J. H. CASTLE & w. 6. ROGERS.

PRESSURE CONTROLLED VALVE. APPLICATION F|L ED SEP T.25| 1913.

1,138,278. Patented May 4, 1915.

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JOHN H. CASTLE AND WILLIAM G. ROGERS, or IAIN-TED ros'r, NEw'YoEK, nssreuons T ING-ERSoLIi RAND .COl VLPANY, OF JERSEY CITY, NEW JERSEY, A =CORPORATION t or NEW JERSEY.

masses.

Application filed September 25, 1913. Serial 110.791,?09.

To all whom it ma concern:

Be it known is at we, JOHN .H. CAs'rLE and WILLIAM G. RocERs, citizens of the United States residing at Painted Post, in the county oi Steuben and State of New York, have invented a certain new and useful Improvement is Pressure-Controlled Valves, of which the following is a specification.

'This invention relates to a pressure con- S trolled valve for use with regulating mechanism for compressors, or similar urposes, and more particularly to a valve 0 the type wherein at a certain predetermined receiver pressure the valve operates to admit such receiver pressure to the regulating 'mecha-' nism, untilthe receiver pressure again falls 1 a certain amount below that required to adjusting the valve not only to operate at different receivefpressures but also to regulate the pressure drop necessary to allow the valve to return to its origlnal posltion after having been opened by a predetermined receiver pressure.

With these objects in View we have devised a valve a practical {embodiment .of which is shown in the accompanying drawing which shows a longitudinal section through the valve innconnection with a diagrammaticsketch of a compressor system in which the valve operates an electric controller switch.

As shown, the systemcomprises a compressor 1 driven by a motor 2 controlled by a switch 3. This switch is operated by a motor comprising a cylinder 4 in which reciprocates a piston 5 attached to the moving element 6 of the switch. A spring 7 normally holds the switch in closed position and the switch is opened by fluid pressure conveyed by a pipe 8 from the valve 9 which forms the subjectof this application.

PRESSURE-CONTROLLED vAEvE. I

Specification of Letters Patent.

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Patented May 4, 1915..

The valve 9 consists of a generally cylindri cal valve chest 10 in the central part of which is a valve chamber 11, from which leads the pipe 8. "From one end of the valve chamber 11 a cylindrical passage- 12 leads to the atmosphere as will be further described. This cylindrical passage is provided at its inner end, where it opens into the valve chest 11, with a beveled valve seat 13. Adjustably threaded-into the other end with a cylindrical passage 15 through it which is of less diameter-than the passage 12. The inner end of the plug 14 is tapered.

down providing a narrowsannular valve seat 16 opposite to and-a1ined with the larger valve seat 13. To'the outer end of the plug 14 a pipe 17 leads from the receiver Situated in the valve chamber 11 is a double ended valve 19 provided on one end-With a beveled flange 20 adapted to seat against.

.60 of the valve chest 10 is a plug 14 provided .18 intowhich the compressor 1 discharges.-

the valve seat- 13 and on theother end with a flange 21. The flange 21 is'of slightly less diameter than the valve chest 11 and is provided on its outer face near the periphery with an annular depression 22.j Inside of the depressi0n22 is a valve surface 23 which seats against the inner end 160i the plug 14, the two surfaces being ground to produce a tight fit. alinement by guides 24-and 25 sliding respectively in passages 12 and 15. Sliding in chamber 12 in, contact with the guide 24 is a spring guide 26 against which presses a spring 2 adjustably threaded into the end of valve chest 10. A vent passage 29, through the end of the spring cup 28, afl'ords communi- I cation from the passage 12 to.the atmos- In operationvthetension of the spring 27 a The valve 19-is kept in held in place by a spring cup 28 is'so regulated that it will counter-balance v ing effective on an area of the valve equiva the receiver pressure exerted on the valve lent to the cross section of the passage 15 At a certain pressure however, determined by the adjustment of the spring 27, the recelver pressure Wlll overcome. the pressure of the spring and move the valve away from the seat 161 The air from the receiver will then rush into passage 11 and by its impact on the flange 21 will move the valve so that the valve surface 20. seats against the valve seat 13, the receiver air at the same time passing around the edges of the flange 21 into the valve chest 11 andthence through thepipe 8 into the cylinder 4. This 10. will raise the piston 5 breaking the switch connection 3 and thus cutting off the motor 2 of the compressor. As the valve seat 13' and the passage 12 leading therefrom are larger than the valve seat 16 and its pas- 15 sage 15, the receiver pressure tending to hold the valve against the seat 13 will be exerted 'upon a greater area than that on which it acts'to move the valve away from seat 16 to admit the receiverpressure to the 20 valve chest. This area has been described in the claims as the holding surface, while the areaof the valve against which the receiver pressure is exerted to move it from the seat 16 has been called the operating surface. As the holding surface is larger than the operating surface the pressure in the receiver must drop due to the non operation of thecompressor to an amount dependent on the difference in the area of these two surfaces before the valve will return.

In the present device the pressure drop required to allow the valve to return to its original position" can be varied by varying the position of the plug 1 f. If this plug is adjusted outwardly for instance, the valve 19 will have a greater travel in going from valve seat 16 to valve seat 13 and hence will compress the spring 27 to a greater degree, 40 assuming of course that the spring 27 in both cases had the same initial compression, and consequently the spring will start the backward movement of the valve with a less pressure drop. By having therefore not only the tension of the spring adjustable but the distance of the valve seats from each other also adjustable, the device can be set so that within the limits imposed by its construction, the valve 19 will move to admit receiver pressure into the valve chest 11 at any determined pressure and will return to its original position after the receiver pres sure has dropped any predetermined amount. When the receiver pressure does thus fallso that the valve 19 again seats against valve seat 16 the valve chest 11 will be open to the atmosphere through the passage 12 and vent passage 29 allowing the fluid under pressure to escape from the cylinder 4 thus causing the spring 7 to force down the piston '5 and close the switch connection 3, again starting the motor to drive the compressor. Although the valve is here shown in connection with a motor operating an electric switch for controlling a compressor motor it is evident that the valve is adapted for use with any compressor regulator or like mechanism for the operation of which it is necessary to admit fluid when the receiver pressure reaches a certain value andto exhaust the admitted fluid when the receiver pressure falls below a certain value.

It is to be understood that the present showing and description discloses only one specified modification of our invention and other forms and modifications are included in the spirit and scope of the invention as expressed in the claims.

What we claim is:

1. In a pressure controlled valve, a valve chest, alined inlet and exhaust openings therein having valve seats, means to ad ust the relative distance of said seats, a movable valve element having portions adapted to alternately seat on said valve seats, a spring tending to hold said valve element against said inlet valve seat, an operating surface on said valve element exposed to said inlet opening of an area sufficient to overcome said spring and open said inlet valve at a predetermined inlet pressure, a flange on said valve element adapted to utilize the velocity of the inlet current and continue the movement of said valve element to seat against said exhaust seat, and a holding surface on said valve element, exposed to said inlet pressure, of an area greater than said operating surface.

2. In a pressure controlled valve, a valve chest, alined inlet and exhaust openings therein having valve seats, means to ad ust the relative distance of said seats, a movable valve element having portions adapted to alternately seat on said valve seats, a spring tending to hold said valve element against said inlet valve seat, means to adjust the tension of said spring, an operating surface on said valve element exposed to said inlet opening of an area sufficient to overcome said spring and opensaid inlet valve .at a 1 predetermined inlet pressure, a flange 011 said valve element adapted to utilize th velocity of the inlet current and continu e the movement of said 'valve element to seafagainst said exhaust seat, and a holding surface on said valve element exposed to sai-dl inlet pressure, of an area greater than saidl operating surface.

3. In a pressure controlled valve, a valve; chest, an inlet opening into said valve chest, 1 an exhaust opening from said valve chest of larger area than said inlet opening, a valve having portions adapted to alternately close said openings, a spring tending to hold said valve to close said inlet opening, and means for adjusting the pressure of said spring.- and the amount of movement of said valve,

4. In a pressure controlled valve, a valve chest, an inlet epening into said velve chest,

an exhaust opening from'said Valve chest'0f' larger area than said inlet opening, a valve having portions adapted to alternately close In testimony whereof We have hereunto set our hands.

JOHN H. CASTLE. WILLIAM G. ROGERS. Witnesses:

A. O. CARPEn rnR, E. O. BONHAM. 

